Bosch 830ES Technical Service Bulletin

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Technical Service Bulletin:Resetting the WatervalveModels: 830ES, 940ES-ESO, C950ES, C1050ES, 1210ES-ESC, T9800/T9900 SE(C)Data subject to change without notice | Printed in the USA | BTC 740002333 A | 05.2018 Bosch Thermotechnology Corp.A qualifi ed service technician is recommended to perform the work.ProblemTankless water heater that doesn’t activate, and doesn’t show an error code.Possible CauseThe watervalve may be clogged or needs to be reset.OverviewSometimes a tankless water heater doesn’t start up when water is turned on (aboveactivation rate), and also doesn’t give an error code. This can be due to the impellerin the watervalve being stuck or clogged, the water valve being closed, or even justa clogged inlet fi lter. Some of the models have an inlet fi lter accessible from outsidethe machine, which you can inspect for debris fi rst. Other models have it directlyin line with the watervalve, in which you will have to disconnect and remove thewatervalve for access.Procedure1. Drain the machine down of any water on both the hot and cold sides.2. Remove the inlet and outlet water clips and remove watervalve from themachine. After it is removed, disconnect all wiring to the watervalve.Inspect the screen for any blockage and clean if necessary.3. Remove the 2 Phillips head screws that hold the watervalve engine to thewatervalve body (Fig. 1).Figure 14. Remove the 2 Phillips head screws that hold the watervalve engine to thewatervalve body (Fig. 1).5. Separate the 2 the watervalve body and the watervalve engine.6. On the valve side, locate the brass gear. Rotate the gear counter clockwise(towards the “0”) until it stops (Fig. 2).Figure 2

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